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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdca5ae7f1431115a40c65e6a48744c4c56c41d556046af38b9f6bb6fff0aea0' 
  AND token = 'ZdwP3v6x9FZPWqIPw9IqW8y6qer/w/ULirCAUaqIfe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}